I was just being sarcastic....my bad.
Here's the thing:
14.5s are not made with some exotic, heavy-duty rubber compound.
The cords and plies aren't special or exotic either.
If they were, they wouldn't be cheaper.
Much of the *higher-in-comparison* load rating, comes from the fact that they're not going to carry that rated weight at the same speeds or for the same expected service life of other trailer tires.
Other trailer tires' rated weight carrying capacities are much more conservative, because they're not designed and built for some "limited-use" duty.

Here's the thing:
14.5s are not made with some exotic, heavy-duty rubber compound.
The cords and plies aren't special or exotic either.
If they were, they wouldn't be cheaper.
Much of the *higher-in-comparison* load rating, comes from the fact that they're not going to carry that rated weight at the same speeds or for the same expected service life of other trailer tires.
Other trailer tires' rated weight carrying capacities are much more conservative, because they're not designed and built for some "limited-use" duty.